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1da177e4 LT |
1 | /* |
2 | * Support for 32-bit Linux for S390 ELF binaries. | |
3 | * | |
4 | * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
5 | * Author(s): Gerhard Tonn (ton@de.ibm.com) | |
6 | * | |
7 | * Heavily inspired by the 32-bit Sparc compat code which is | |
8 | * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com) | |
9 | * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek (jj@ultra.linux.cz) | |
10 | */ | |
11 | ||
12 | #define __ASMS390_ELF_H | |
13 | ||
14 | #include <linux/time.h> | |
15 | ||
16 | /* | |
17 | * These are used to set parameters in the core dumps. | |
18 | */ | |
19 | #define ELF_CLASS ELFCLASS32 | |
20 | #define ELF_DATA ELFDATA2MSB | |
21 | #define ELF_ARCH EM_S390 | |
22 | ||
23 | /* | |
24 | * This is used to ensure we don't load something for the wrong architecture. | |
25 | */ | |
26 | #define elf_check_arch(x) \ | |
27 | (((x)->e_machine == EM_S390 || (x)->e_machine == EM_S390_OLD) \ | |
28 | && (x)->e_ident[EI_CLASS] == ELF_CLASS) | |
29 | ||
30 | /* ELF register definitions */ | |
31 | #define NUM_GPRS 16 | |
32 | #define NUM_FPRS 16 | |
33 | #define NUM_ACRS 16 | |
34 | ||
35 | /* For SVR4/S390 the function pointer to be registered with `atexit` is | |
36 | passed in R14. */ | |
37 | #define ELF_PLAT_INIT(_r, load_addr) \ | |
38 | do { \ | |
39 | _r->gprs[14] = 0; \ | |
40 | } while(0) | |
41 | ||
42 | #define USE_ELF_CORE_DUMP | |
43 | #define ELF_EXEC_PAGESIZE 4096 | |
44 | ||
45 | /* This is the location that an ET_DYN program is loaded if exec'ed. Typical | |
46 | use of this is to invoke "./ld.so someprog" to test out a new version of | |
47 | the loader. We need to make sure that it is out of the way of the program | |
48 | that it will "exec", and that there is sufficient room for the brk. */ | |
49 | ||
50 | #define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2) | |
51 | ||
52 | /* Wow, the "main" arch needs arch dependent functions too.. :) */ | |
53 | ||
54 | /* regs is struct pt_regs, pr_reg is elf_gregset_t (which is | |
55 | now struct_user_regs, they are different) */ | |
56 | ||
57 | #define ELF_CORE_COPY_REGS(pr_reg, regs) dump_regs32(regs, &pr_reg); | |
58 | ||
59 | #define ELF_CORE_COPY_TASK_REGS(tsk, regs) dump_task_regs32(tsk, regs) | |
60 | ||
61 | #define ELF_CORE_COPY_FPREGS(tsk, fpregs) dump_task_fpu(tsk, fpregs) | |
62 | ||
63 | /* This yields a mask that user programs can use to figure out what | |
64 | instruction set this CPU supports. */ | |
65 | ||
66 | #define ELF_HWCAP (0) | |
67 | ||
68 | /* This yields a string that ld.so will use to load implementation | |
69 | specific libraries for optimization. This is more specific in | |
70 | intent than poking at uname or /proc/cpuinfo. | |
71 | ||
72 | For the moment, we have only optimizations for the Intel generations, | |
73 | but that could change... */ | |
74 | ||
75 | #define ELF_PLATFORM (NULL) | |
76 | ||
77 | #define SET_PERSONALITY(ex, ibcs2) \ | |
78 | do { \ | |
79 | if (ibcs2) \ | |
80 | set_personality(PER_SVR4); \ | |
81 | else if (current->personality != PER_LINUX32) \ | |
82 | set_personality(PER_LINUX); \ | |
83 | set_thread_flag(TIF_31BIT); \ | |
84 | } while (0) | |
85 | ||
86 | #include "compat_linux.h" | |
87 | ||
88 | typedef _s390_fp_regs32 elf_fpregset_t; | |
89 | ||
90 | typedef struct | |
91 | { | |
92 | ||
93 | _psw_t32 psw; | |
94 | __u32 gprs[__NUM_GPRS]; | |
95 | __u32 acrs[__NUM_ACRS]; | |
96 | __u32 orig_gpr2; | |
97 | } s390_regs32; | |
98 | typedef s390_regs32 elf_gregset_t; | |
99 | ||
100 | static inline int dump_regs32(struct pt_regs *ptregs, elf_gregset_t *regs) | |
101 | { | |
102 | int i; | |
103 | ||
104 | memcpy(®s->psw.mask, &ptregs->psw.mask, 4); | |
105 | memcpy(®s->psw.addr, (char *)&ptregs->psw.addr + 4, 4); | |
106 | for (i = 0; i < NUM_GPRS; i++) | |
107 | regs->gprs[i] = ptregs->gprs[i]; | |
108 | save_access_regs(regs->acrs); | |
109 | regs->orig_gpr2 = ptregs->orig_gpr2; | |
110 | return 1; | |
111 | } | |
112 | ||
113 | static inline int dump_task_regs32(struct task_struct *tsk, elf_gregset_t *regs) | |
114 | { | |
c7584fb6 | 115 | struct pt_regs *ptregs = task_pt_regs(tsk); |
1da177e4 LT |
116 | int i; |
117 | ||
118 | memcpy(®s->psw.mask, &ptregs->psw.mask, 4); | |
119 | memcpy(®s->psw.addr, (char *)&ptregs->psw.addr + 4, 4); | |
120 | for (i = 0; i < NUM_GPRS; i++) | |
121 | regs->gprs[i] = ptregs->gprs[i]; | |
122 | memcpy(regs->acrs, tsk->thread.acrs, sizeof(regs->acrs)); | |
123 | regs->orig_gpr2 = ptregs->orig_gpr2; | |
124 | return 1; | |
125 | } | |
126 | ||
127 | static inline int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs) | |
128 | { | |
129 | if (tsk == current) | |
130 | save_fp_regs((s390_fp_regs *) fpregs); | |
131 | else | |
132 | memcpy(fpregs, &tsk->thread.fp_regs, sizeof(elf_fpregset_t)); | |
133 | return 1; | |
134 | } | |
135 | ||
136 | #include <asm/processor.h> | |
6252d702 | 137 | #include <asm/pgalloc.h> |
1da177e4 | 138 | #include <linux/module.h> |
1da177e4 LT |
139 | #include <linux/elfcore.h> |
140 | #include <linux/binfmts.h> | |
141 | #include <linux/compat.h> | |
142 | ||
143 | #define elf_prstatus elf_prstatus32 | |
144 | struct elf_prstatus32 | |
145 | { | |
146 | struct elf_siginfo pr_info; /* Info associated with signal */ | |
147 | short pr_cursig; /* Current signal */ | |
148 | u32 pr_sigpend; /* Set of pending signals */ | |
149 | u32 pr_sighold; /* Set of held signals */ | |
150 | pid_t pr_pid; | |
151 | pid_t pr_ppid; | |
152 | pid_t pr_pgrp; | |
153 | pid_t pr_sid; | |
154 | struct compat_timeval pr_utime; /* User time */ | |
155 | struct compat_timeval pr_stime; /* System time */ | |
156 | struct compat_timeval pr_cutime; /* Cumulative user time */ | |
157 | struct compat_timeval pr_cstime; /* Cumulative system time */ | |
158 | elf_gregset_t pr_reg; /* GP registers */ | |
159 | int pr_fpvalid; /* True if math co-processor being used. */ | |
160 | }; | |
161 | ||
162 | #define elf_prpsinfo elf_prpsinfo32 | |
163 | struct elf_prpsinfo32 | |
164 | { | |
165 | char pr_state; /* numeric process state */ | |
166 | char pr_sname; /* char for pr_state */ | |
167 | char pr_zomb; /* zombie */ | |
168 | char pr_nice; /* nice val */ | |
169 | u32 pr_flag; /* flags */ | |
170 | u16 pr_uid; | |
171 | u16 pr_gid; | |
172 | pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid; | |
173 | /* Lots missing */ | |
174 | char pr_fname[16]; /* filename of executable */ | |
175 | char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */ | |
176 | }; | |
177 | ||
178 | #include <linux/highuid.h> | |
179 | ||
1da177e4 LT |
180 | /* |
181 | #define init_elf_binfmt init_elf32_binfmt | |
182 | */ | |
183 | ||
184 | #undef start_thread | |
185 | #define start_thread start_thread31 | |
186 | ||
6252d702 MS |
187 | static inline void start_thread31(struct pt_regs *regs, unsigned long new_psw, |
188 | unsigned long new_stackp) | |
189 | { | |
190 | set_fs(USER_DS); | |
191 | regs->psw.mask = psw_user32_bits; | |
192 | regs->psw.addr = new_psw; | |
193 | regs->gprs[15] = new_stackp; | |
194 | crst_table_downgrade(current->mm, 1UL << 31); | |
195 | } | |
196 | ||
1da177e4 LT |
197 | MODULE_DESCRIPTION("Binary format loader for compatibility with 32bit Linux for S390 binaries," |
198 | " Copyright 2000 IBM Corporation"); | |
199 | MODULE_AUTHOR("Gerhard Tonn <ton@de.ibm.com>"); | |
200 | ||
201 | #undef MODULE_DESCRIPTION | |
202 | #undef MODULE_AUTHOR | |
203 | ||
204 | #undef cputime_to_timeval | |
205 | #define cputime_to_timeval cputime_to_compat_timeval | |
4d284cac | 206 | static inline void |
1da177e4 LT |
207 | cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value) |
208 | { | |
209 | value->tv_usec = cputime % 1000000; | |
210 | value->tv_sec = cputime / 1000000; | |
211 | } | |
212 | ||
213 | #include "../../../fs/binfmt_elf.c" | |
214 |